The correct phrasing should be, "I didn't know that." The past tense of "know" is "knew," so using "knew" in this context would be incorrect.
No, the correct statement is: That is mine.
Yes, it is correct to say "you are correct." It acknowledges that the other person's statement or opinion is accurate.
No, the correct statement is "Are you going to school?" using the verb "are" instead of "is."
Are your children coming home? is grammatically correct.
"Is he at office?" is in fact correct, but a very old fashioned way of making that statement. A more current way would be "Is he in the office?" or "Is he in his office?"
i knew the answer and hailey didnt sorry :(I knew the question to the math problem.
he knew it cold
No, the correct statement is: That is mine.
No, the correct phrase is "he knew winter was coming." The word "had" is unnecessary in this sentence.
I knew you would love it
Yes, it is correct to say "you are correct." It acknowledges that the other person's statement or opinion is accurate.
No, the correct statement is "Are you going to school?" using the verb "are" instead of "is."
She knew the correct answer was 5, but she didn't care.
Are your children coming home? is grammatically correct.
A statement that is factually correct and does not mislead.
That is correct.
It Must Be "I Knew About This Long Ago".